Originally Posted by ZX2 Nick

Run-flat tires suck, they are too stiff, I don't believe run flats came on Crossfires OEM. An additional problem with the rear size 255/35/19 is that most (if not all) are XL load rating because that size is somewhat common on heavier cars and SUVs.

I run standard passenger 225/40/18 Yokohama AVID All-Season on the front and Pirelli P Zero Nero High Performance All-Season on the rear in 255/40/19 which are 1 inch larger in diameter overall. Both have appropriate speed and load ratings though they are different from each other, 92V and 96W. The fronts were an Audi OEM fitment and the rears are Mustang GT (Performance Pack) front fitment.

Here's the kicker, I bought all of them used (from a used tire dealer) and by used I mean they are brand new dealer take offs with less than 100 miles on them. I have no issues with buying used tires, the dealers check them all for damage and that they hold air on a rim. I've had real issues with brand new tires from places whose name rhymes with Shack to go through that again. An interesting not is that OEM tires have all the UTQG numbers on the sidewall other than treadwear though you can look those up online.